Miter square



Nov. 13, 1912s. y 1,691,118A

W. LISSY MITER SQUARE Filed Dec. 2l, 1925 un l Patente-d Nov. 13, '1928.

"unire s'rnree MITER S QUARE.

Application filed December 21, i925. No 'IG My present invention reluteeto improvements in initier sqruires of the straight edge typecomprising-Jl e stock und ufpivoteiil, slidable, and detachable blade"hereby the bl d und stock muy be errang-ed et various ongle, es esingle struight edge ruler or the parte alined es u inerler. Theinsruinent is ca,- peble of adjustment on its pivot zit various :inglesfor use in co-operntion with rfi-dini nier rings ne u initer square; itmuy With 'lucility be arranged for use in co-ouerution Wi 'h pencil foru inni-lier Within d gree of din'iensions; end in addition to its ueY esn single straight edge or ruler the instruinent inny readily beconverted into e trysquare.

The invent-ion consists in certain novel coinbinutions end arrangementsof ports Wherebythe instrument may readily be adapted for the above undother uses, ne will hereinafter be more fully pointed outv end oloiined.

In the accompanying drawings l have illustrated several uses oi theinstrument in which the physical embodiment of the invent-ion shows thecombinations and arrangements of perte: eccordingl to the best inode lhave thus ier devised for the practical application of the principles ofniy invention.

Figure l is a perspective view oit the instruinent used us e initersquare. Figure 2 is e perspective view o1 the instrument used is ennlrler. Figure 8 is e plen view of the instrument converted into uStraight edge, und in dotted lines shown es e. tnv-square. Figure l isun enlarged detail sectional vieiv 'teken transversely through thecenter of Fig. 2 at the pivot bolt.

In carrying` out my invention li utilize a lstock l in the forni of eWooden ber, rectangular in cross sect-ion end preferably provided withinetnl edges and corners 2. In the upper fece of the stock is feshionedn longitudinally extending' slot 3 benezirh which ie in undercut groove4l.

ln connection with the stock i utilize e detachable blade 5 capable ofbeing' arranged in various relations to the Steeb: end preferably ofWood with motel edges une corners G.

An interchungeeble bolt 7 is used neer one end oi the blade7 which boltprojects beloiv its under surface and the projectingl end oit' the boltie fashioned With e, non-rotatable hee d 8 which is retained endndeilited to slide in the undercut groove 4l While the bolt travelsthrough the slot 3.

A clamp nurJ 9 is used on the bolt end prow der vided with o heed l0r'ushioned for conxf'enience of the thumb und linger in turning it.

fr snirit level 1,4- is set in the stoel: between l. one oit ite edgesund the control longitudinal slotn 3 for use in the usuel innnner.

ln liieurn l and the instrument ie illus- 'tinted lier use :ie e imitersquere and es e Inerlrer 1espectivelyln the lirst instance the blade muywith facility be adjusted on its pivot to the desired onglecoiirlorining)i te one of the radial lines on the fece of the stock andclamped in such position by ineens of the nut 9. There :ire tivooppoeitely arranged radial scales, one et euch side of the longitudinalcenter oi' the stockD und the blade may be shifted to either oi thesescales end adjusted to e desired ongle.

ln Figure tlie instrument is used as e innrlzer in connection with e.pencil P for inzulringon n bor-.rd er plank ne B. For this purpose 'theblude is turned on its pivot perullel With the xstock end the blade isthen ndjusted longitudinally ol the slot to project beyond the end ofthe stoel; the desired distence indicated on the scales along; the sidesof edges of the blede. The end of the stocl and the underfnce of theprojecting end ol the blu de thus forni :in :iccurutc end Stable guide,after the nut 9 has been clamped tight, for the pencil P.

ln addition to these uees the instrument is edupted for use es e singleelruigjht edge :is in full linee Figure 3, or try square ne indicated bythe dotted lines for the blede in seid tiefere. For this purpose tbeblede is provided with e` loi y tudinfilly extending bolt l5 its endoppos te to the pivotal end of the blade. end the belly Sei A.ed `in elongitud' inlly extending1 einen o; in one end of the blade. The bolt isehi-oued with un inicl.eral T-heod l@ which is norinellv retracted in esocket l? in the end oi the blo. de es seen in Fie'. l.

This T-heed of the bolt is adapted to selectively engage either crosegroove 18 fashioned at the end of the stock when the instruinent is usedas a ruler or straight edge, or the head may engage a longitudinallyextending socket 19 near the opposite end of the stock and locatedfinone of itsside edges.

A usual ela-mp nut 2O is provided for the bolt 15 for locking the boltin position.

The T-head makes aV tight :trictional engagenient and close fit With theWalls of the cross groove 18 or the Walls of the socket 19v of thestock. Thus when used as a single straight edge or ruler as 1n fulllines Figure y 3 the blade and stock are lirst disconnected i at theirpivotal points,

and then the T-head is loosened by unscreiving the nut 20. The T-head isthen slid :troni one side into the groove 18 and the blade is thusbrought into alinernent with the stock and the parts are clampedtogether by turning nut 20.

When used as a try-square as indicated by dotted lines in Figure 3, thedetached blade is turned at right angles to the stock and the projectedT-head of the boltis first slid into the open end of slot 19 and thenforced into rictional contact with the Walls of this longitudinallyextending groove 19 of the stock by turning` tbe nut- 20.

It Will be apparent thatJ various other ad-` justments and uses inay bedevised for the instrument by those familiar with carpentry vand liketrades.

WiLLIAM Lrssv.

